Rising Treasury Yields: What America's Debt Problem Means for Investors

Why Are Long-Term Interest Rates Rising?

The 10-year U.S. Treasury yield has climbed above 5%, a level not seen in years. While several factors are contributing to higher interest rates, one issue stands out: America's growing debt burden.

The Federal Reserve is no longer holding interest rates at artificially low levels, and investors remain concerned about inflation. But beneath both of these concerns is a larger fiscal challenge: the federal government's rapidly growing debt and the cost of servicing it.

The Cost of Debt Is Reaching Historic Levels

As Fiscal Year 2026 comes to a close on September 30th, net interest payments on the national debt are expected to exceed $1 trillion. That's more than the federal government spends on national defense.

Interest payments now account for roughly 3.3% of U.S. GDP, the highest level recorded since at least World War II.

Historically, the U.S. has faced elevated debt costs before. During the 1980s and 1990s, debt service consumed a similar share of GDP. The difference is that policymakers at the time had a path toward improving the nation's fiscal position.

What Was Different in the 1980s and 1990s?

Several factors helped improve the government's finances:

• Stronger economic growth
• Spending restraint in many areas of government
• The end of the Cold War and reduced geopolitical pressures
• Bipartisan efforts to balance budgets

These developments ultimately led to budget surpluses and helped reduce net interest costs to approximately 1% to 2% of GDP for decades.

Why Today's Challenge May Be Harder

The current fiscal landscape looks very different.

Programs such as Social Security and Medicare now consume a significantly larger share of the economy than they did several decades ago. At the same time, it is difficult to envision major reductions in defense spending.

As a result, the government's flexibility to reduce spending is considerably more limited.

Meanwhile, the U.S. continues to run large budget deficits while also competing for capital with enormous private-sector investments in areas such as artificial intelligence and data center infrastructure.

What Could Happen Next?

Many economists and policymakers believe long-term fiscal reform will eventually require difficult decisions. Potential solutions could include:

• Slower growth in government spending
• Reform of entitlement programs
• Policies that support stronger economic growth
• Tax increases if spending reforms are delayed

While no one knows exactly how this will unfold, the trajectory of federal debt remains a growing concern for investors and policymakers alike.

What It Means for Investors

Higher government borrowing needs can place upward pressure on interest rates, potentially affecting:

• Bond yields
• Mortgage rates
• Corporate borrowing costs
• Stock market valuations
• Future tax policy

We are not forecasting a crisis. However, the nation's fiscal path deserves attention because it has meaningful implications for long-term investment planning.

Understanding these trends helps us make more informed decisions about portfolio construction, risk management, and long-term financial goals.

If you'd like to discuss how today's interest rate environment may affect your portfolio, retirement plan, or long-term financial strategy, contact Summit Oak Advisors to schedule a conversation.